JPH10192225A - Tip part of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cover lens from being broken with the help of an air supply nozzle and a water supply nozzle, without arranging special parts on a tip part body. SOLUTION: This tip part of an endoscope consists of an air supply nozzle 43, a water supply nozzle 44 and an optical lens 46a which are arranged protruding from the tip face of a tip part body 31. In this case, the surface of the optical lens 46a is arranged so that the surface does not protrude from an imaginary plane 100 formed by an isosceles triangle which has a vertical angle C on the ridge of the tip part body 31, with the protruding end A of the air supply nozzle 43 and the protruding end B of the water supply nozzle 44 as bases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distal end of an endoscope on which an optical lens is arranged.

[0002]

2. Description of the Related Art An observation window is provided on a distal end body provided at the distal end of an endoscope, and a cover lens attached thereto is provided so that water droplets and the like do not easily accumulate on the surface. Are arranged so as to protrude from the surface. Therefore, when the cover lens is a lens that is convex outward such as a convex lens, the amount of protrusion is large.

Further, a water supply nozzle, an air supply nozzle, and the like for cleaning the surface of the cover lens are arranged on the tip end body so as to protrude from the same surface as the observation window.

[0004]

At the distal end of the endoscope in which the outwardly convex cover lens protrudes from the surface of the distal end body as described above, the amount of projection of the cover lens is large. If the insertion portion of the endoscope is accidentally dropped, the cover lens may hit the floor or the like and be damaged, so that major repair may be required.

[0005] Such an accident does not occur if the air supply nozzle and the water supply nozzle protruding from the tip end body are disposed so as to protect the cover lens. However, the conventional nozzle has good cleaning properties. Therefore, even if it is provided so as to protrude from the distal end main body, it does not serve to protect the cover lens.

Accordingly, the present invention provides a distal end portion of an endoscope which can prevent a cover lens from being damaged by an air supply nozzle and a water supply nozzle without arranging a special part in the distal end portion main body. Aim.

[0007]

In order to achieve the above object, the distal end portion of the endoscope according to the present invention comprises an air supply nozzle, a water supply nozzle, and an outwardly convex optical lens. At the distal end of the endoscope protruding from the surface, the surface of the optical lens has an apex angle on the ridge line of the distal end body with the protruding end of the air supply nozzle and the protruding end of the water supply nozzle as bases. It is characterized by being arranged so as not to protrude from a virtual plane formed by an equilateral triangle.

The outer surface of the optical lens may be a convex surface or a flat surface. Further, the optical lens may be a cover lens of an objective optical system or a cover lens of an illumination light guide.

[0009]

Embodiments of the present invention will be described with reference to the drawings. 3 and 4 are a side sectional view and a front view of the distal end portion of the insertion section of the endoscope. The tip body 31 is
It is formed of a single component made of an electrically insulating plastic material, and is connected to a distal end portion of a curved portion 32 which is provided at the distal end of an elongated flexible tubular insertion portion so as to be freely bent by remote control.

The bending portion 32 rotatably connects a number of node rings 33 by rivets 34, and has a mesh tube 35 around its outer periphery.
, And the outer surface thereof is further covered with an outer cover 36 made of a rubber tube or the like. The distal end portion of the outer cover 36 is tightly bonded to the outer peripheral surface of the distal end portion main body 31. 38 is a bending operation wire.

The distal end main body 31 and the curved portion 32 are screwed with female screws, and the foremost node ring 33 is screwed to a metal screw piece 37 embedded in a concave portion of the distal end main body 31. Are linked by

The endoscope according to the present embodiment is a so-called forward-looking type endoscope for observing the front, and an observation window 41, an illumination window 42, an air supply nozzle 43, a water supply nozzle 44, and a forceps channel outlet hole 45
Etc. are provided. The tip hood and tip cap are not attached to the tip body 31.

An objective lens group 46 is provided inside the observation window 41.
Are fixed in a metal lens frame 47 by a spacer 49 at predetermined intervals. 46a is the objective lens group 4
The first lens 6 is an observation window cover lens that closes the observation window 41.

An insulating ring 51 made of an electrically insulating plastic material is joined to the outer peripheral portion of the front half of the lens frame 47. The outer peripheral surface of the insulating ring 51 is inserted into a hole 52 having a circular cross section formed in the front end portion of the distal end portion main body 31 in parallel with the axial direction, and an O-ring 53 for sealing is provided at the fitting portion. It is installed. Reference numeral 54 denotes a defoamed electrically insulating adhesive.

The connecting member 48 fixed to the rear end portion of the lens frame 47 has a rectangular outer shape, and a distal end portion of a metallic shield pipe 55 is fitted and joined to the outer peripheral portion. .

The shield pipe 55 has a rectangular hole 5 formed continuously therethrough to the rear end of the distal end main body 31.
6 and a solid-state imaging device 10 formed of, for example, a charge-coupled device (CCD).
Are fixed with the light receiving surface 11 facing forward.

A color correction filter 58 is attached to the front surface of the cover glass 13 attached to the front surface. Reference numeral 59 denotes a light shielding mask for shielding unnecessary light around the optical path.

Electronic components 61 for processing signals input to and output from the solid-state imaging device 10 are provided in the shield pipe 55.
Are attached to the wiring board 62 and arranged on the rear side of the solid-state imaging device 10. Then, the signal cable 63 is led backward from there.

Insulating tapes 64 and 65 are wound around the outer peripheral surface of the components arranged in the shield pipe 55 and the outer peripheral surface of the shield pipe 55, respectively, to electrically insulate the shield pipe 55 from the inside and outside thereof. ing.

An illumination window cover lens 70 for expanding the distribution of illumination light is attached to the illumination window 42, and an emission end (not shown) of an illumination light guide fiber bundle is disposed behind the illumination window cover lens 70. ing. The outlet side ends of the air supply tube 71 and the water supply tube (not shown) are arranged behind the air supply nozzle 43 and the water supply nozzle 44.

The observation window cover lens 46 a attached to the observation window 41 is an optical lens having a convex outer surface, and is arranged so that the surface protrudes from the distal end surface of the distal end main body 31.

The air supply nozzle 43 and the water supply nozzle 44
Is, as shown in FIG. 3, an observation window cover lens 46a.
Projecting from the distal end face of the distal end body 31 higher than
As shown in FIG. 4, the air supply nozzle 43 and the water supply nozzle 4
4 are arranged on both sides of the observation window cover lens 46a with the observation window cover lens 46a interposed therebetween.

Here, as shown in FIG. 2, an isosceles triangle having an apex angle C on the ridge line of the tip end body 31 is drawn with the tip A of the air supply nozzle 43 and the tip B of the water supply nozzle 44 as the bottom. .

Such an isosceles triangle can be drawn on both sides with the line segment AB as the base, but it is assumed that the line segment AB has a vertex angle C in the same direction as the observation window cover lens 46a.

Assuming a virtual plane 100 formed by the isosceles triangles, as shown in FIG. 1, the surface of the observation window cover lens 46a is
It is arranged so as not to protrude from zero.

Therefore, even if the insertion portion of the endoscope is inadvertently dropped and the tip main body 31 hits the floor or the like, the floor is hit by the ridge of the tip main body 31, the air supply nozzle 43, and the water supply nozzle 44. Therefore, the observation window cover lens 46a does not hit the floor. Therefore, the observation window cover lens 46a is prevented from being broken without disposing any special components on the distal end portion main body 31.

The present invention is not limited to the embodiment. For example, the object to be prevented from being damaged by the ridge of the tip end body 31, the air supply nozzle 43, and the water supply nozzle 44 is an illumination window cover lens. It may be 70. The present invention may be applied to a case where the outer surfaces of the cover lenses 46a and 70 are flat.

[0028]

According to the present invention, the surface of the optical lens is
The insertion part was accidentally dropped because the tip of the air supply nozzle and the tip of the water supply nozzle were arranged so as not to protrude from the plane formed by the isosceles triangle having the apex angle on the ridgeline of the tip body with the bottom as the base. In such a case, breakage of the optical lens can be prevented without disposing a special component on the distal end body.

[Brief description of the drawings]

FIG. 1 is a partial side view of a distal end body showing a virtual plane according to an embodiment of the present invention.

FIG. 2 is a front view of the distal end body showing a virtual plane according to the embodiment of the present invention.

FIG. 3 is a side sectional view of a distal end of an insertion portion of the endoscope according to the embodiment of the present invention.

FIG. 4 is a front view of a distal end of an insertion portion of the endoscope according to the embodiment of the present invention.

[Explanation of symbols]

 31 tip main body 43 air supply nozzle 44 water supply nozzle 46a observation window cover lens 100 virtual plane

Claims (5)

[Claims] 1. An endoscope in which an air supply nozzle, a water supply nozzle, and an optical lens are disposed so as to protrude from a distal end surface of a distal end body, wherein the surface of the optical lens is in contact with a protruding end of the air supply nozzle. A distal end of the endoscope, wherein the distal end of the endoscope is arranged so as not to protrude from a virtual plane formed by an isosceles triangle having an apex angle on a ridge line of the distal end body with the protruding end of the water supply nozzle as a base. . 2. The endoscope according to claim 1, wherein the outer surface of the optical lens is convex. 3. An endoscope according to claim 1, wherein the outer surface of said optical lens is flat. 4. The endoscope according to claim 1, wherein the optical lens is a cover lens of an objective optical system. 5. The endoscope according to claim 1, wherein the optical lens is a cover lens of a light guide for illumination.